http://www.peachparts.com/shopforum/forumdisplay.php?f=14

For good mechanics

1. You might be overheating, having some problems with your cooling system. Also you could have vacuum or fuel hose leak some where. It could be many things, more specific info is needed.

2. It could be you ac compressor clutch.

Does it work when your at a stop or when your driving? More info is needed.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)